RY2121

{
  "schema_version": 1,
  "type": "component",
  "slug": "ry2121",
  "title": "RY2121",
  "brief": "RYCHIP AC-DC Controllers and Regulators, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "ry2121"
  ],
  "component": {
    "mpn": "RY2121",
    "manufacturer": "RYCHIP",
    "package": "SOT-23-5",
    "pin_count": 5,
    "category": "PMIC",
    "subcategory": "AC-DC Controllers and Regulators",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2108261730_RYCHIP-Semiconductor-Inc--RY2121_C2887853.pdf",
    "parts": {
      "symbol": "ry2121.kicad_sym",
      "footprint": "ry2121.kicad_mod",
      "model_3d": "ry2121-etched.glb",
      "model_3d_plain": "ry2121.glb",
      "model_3d_step": "ry2121-etched.step",
      "model_3d_step_plain": "ry2121.step",
      "lbr": "ry2121.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "OUT",
        "type": "power_out",
        "description": "Switched power output. Delivers input voltage to the load through the internal 80mΩ MOSFET when EN is asserted. Discharged through an internal ~150Ω resistance during shutdown."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. Also serves as the case position for θJC thermal measurement per the datasheet note."
      },
      {
        "number": "3",
        "name": "SET",
        "type": "input",
        "description": "Current-limit programming pin. Connect a resistor RSET from this pin to GND to program the current-limit threshold (e.g. 6.8kΩ ≈ 1.18A typ; range 0.4A to 2A)."
      },
      {
        "number": "4",
        "name": "EN",
        "type": "input",
        "description": "Active-high ON/OFF control. Pull high (VIH ≥ 1.2V) to enable the switch; pull low (VIL ≤ 0.8V) to disable. Do not leave floating. ENB leakage ≤ 1μA at 5.5V."
      },
      {
        "number": "5",
        "name": "IN",
        "type": "power_in",
        "description": "Power supply input, 2.4V to 5.5V. Source for the switched output through the internal power MOSFET. Monitored by the UVLO circuit (VIN_UVLO ≈ 2.3V with 0.1V hysteresis)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2108261730_RYCHIP-Semiconductor-Inc--RY2121_C2887853.pdf",
        "pages": 9,
        "sha256": "15aeb628abbe0889",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 5,
        "described": 5,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ry2121.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "720a6eab0024069bbee68e7cb4c3ff1149468a34611225cdc852662c5d0ec2b7",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ry2121-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "722296eb4404f70980619e2887ad69784b0f805aa4197dacb31f0caed8e66958",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "RYCHIP",
      "Package": "SOT-23-5",
      "Category": "PMIC",
      "Pins": "5"
    }
  },
  "variants": [
    {
      "mpn": "RY212170702013",
      "kind": "packaging"
    }
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ry2121"
  ],
  "discovery_pitch": "RY2121 (RYCHIP) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ry2121.kicad_sym",
    "ry2121.kicad_mod",
    "ry2121.glb",
    "ry2121.step",
    "ry2121.lbr",
    "docs/hero.png",
    "docs/ry2121-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T05:23:15.575Z"
}